CN113394976A - Auxiliary power supply circuit and power supply device - Google Patents
Auxiliary power supply circuit and power supply device Download PDFInfo
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- CN113394976A CN113394976A CN202110215043.1A CN202110215043A CN113394976A CN 113394976 A CN113394976 A CN 113394976A CN 202110215043 A CN202110215043 A CN 202110215043A CN 113394976 A CN113394976 A CN 113394976A
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M3/00—Conversion of dc power input into dc power output
- H02M3/02—Conversion of dc power input into dc power output without intermediate conversion into ac
- H02M3/04—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters
- H02M3/10—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M3/145—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
- H02M3/155—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/0003—Details of control, feedback or regulation circuits
- H02M1/0006—Arrangements for supplying an adequate voltage to the control circuit of converters
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M3/00—Conversion of dc power input into dc power output
- H02M3/02—Conversion of dc power input into dc power output without intermediate conversion into ac
- H02M3/04—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters
- H02M3/10—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M3/145—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
- H02M3/155—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
- H02M3/156—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of output voltage or current, e.g. switching regulators
- H02M3/158—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of output voltage or current, e.g. switching regulators including plural semiconductor devices as final control devices for a single load
- H02M3/1582—Buck-boost converters
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M3/00—Conversion of dc power input into dc power output
- H02M3/02—Conversion of dc power input into dc power output without intermediate conversion into ac
- H02M3/04—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters
- H02M3/10—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M3/145—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
- H02M3/155—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
- H02M3/156—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of output voltage or current, e.g. switching regulators
- H02M3/158—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of output voltage or current, e.g. switching regulators including plural semiconductor devices as final control devices for a single load
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/08—Circuits specially adapted for the generation of control voltages for semiconductor devices incorporated in static converters
- H02M1/088—Circuits specially adapted for the generation of control voltages for semiconductor devices incorporated in static converters for the simultaneous control of series or parallel connected semiconductor devices
- H02M1/096—Circuits specially adapted for the generation of control voltages for semiconductor devices incorporated in static converters for the simultaneous control of series or parallel connected semiconductor devices the power supply of the control circuit being connected in parallel to the main switching element
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/42—Circuits or arrangements for compensating for or adjusting power factor in converters or inverters
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M3/00—Conversion of dc power input into dc power output
- H02M3/02—Conversion of dc power input into dc power output without intermediate conversion into ac
- H02M3/04—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters
- H02M3/10—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M3/145—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
- H02M3/155—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
- H02M3/156—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of output voltage or current, e.g. switching regulators
Abstract
An auxiliary power supply circuit (1) receives power from an auxiliary power supply (AV1) having a negative electrode connected to a switch node, and supplies power to a capacitor (AV2) having a negative electrode connected to a high potential node, the auxiliary power supply circuit (1) comprising: a switching element (HS1) connected between the high potential node and the switching node; and a diode (SD1) having an anode connected to the positive electrode of the auxiliary power supply (AV1) and a cathode connected to the positive electrode of the capacitor (AV2), wherein the voltage at the switching node is alternately switched between (i) a first voltage substantially equal to the voltage at the high-potential node and (ii) a second voltage lower than the first voltage.
Description
Technical Field
The following disclosure relates to an auxiliary power supply circuit.
Background
The auxiliary power supply circuit supplies auxiliary power for the operation of the auxiliary circuit. In the auxiliary power supply circuit, miniaturization is also important. Japanese patent laid-open No. 2015-154682 discloses a bootstrap circuit for the purpose of downsizing an auxiliary power supply circuit.
Documents of the prior art
Patent document
Patent document 1: japanese laid-open patent publication No. 2015-154682
Disclosure of Invention
However, in the conventional auxiliary power supply circuit which is miniaturized, the auxiliary power supply cannot be supplied to the high potential node. An object of one aspect of the present disclosure is to provide an auxiliary power supply circuit capable of supplying an auxiliary power supply to a high potential node.
In order to solve the above problem, an auxiliary power supply circuit according to an aspect of the present disclosure receives power from an auxiliary power supply whose negative electrode is connected to a switch node, and supplies power to a capacitor whose negative electrode is connected to a high potential node, the auxiliary power supply circuit including: a switching element connected between the high potential node and the switching node; and a diode having an anode connected to a positive electrode of the auxiliary power supply and a cathode connected to a positive electrode of the capacitor, wherein a voltage of the switching node is alternately switched to (i) a first voltage substantially equal to a voltage of the high potential node and (ii) a second voltage lower than the first voltage.
According to an aspect of the present disclosure, an auxiliary power supply circuit capable of supplying an auxiliary power supply to a high potential node can be provided.
Drawings
Fig. 1 is a diagram showing a circuit configuration of a power supply circuit according to a first embodiment.
Fig. 2 is a diagram showing waveforms of voltages and currents of the auxiliary power supply circuit.
Fig. 3 is a diagram showing a path of a current of the auxiliary power supply circuit.
Fig. 4 is a diagram showing a circuit configuration of a power supply circuit of the second embodiment.
Fig. 5 is a diagram showing a power supply device of the third embodiment.
Detailed Description
[ first embodiment ]
The auxiliary power supply circuit 1 and the power supply circuit 10 according to the first embodiment will be described below with reference to fig. 1. For convenience of explanation, members having the same functions as those described in the first embodiment are given the same reference numerals in the following embodiments, and the explanation thereof will not be repeated. For simplicity of description, for example, "power supply HV 1" is also simply referred to as "HV 1". Note that each numerical value described below is merely an example.
(definition of wording)
Before the description of the auxiliary power supply circuit 1, in the present specification, the following terms are defined.
"power supply circuit": and a circuit for converting power from the power supply on the input side to the power supply on the output side. As one example, a circuit that converts power from a power source of AC230V to a power source of DC 400V. The power conversion includes, for example, well-known ac, dc conversion or ac frequency conversion.
"power supply device": provided is a device provided with a power supply circuit.
The power supply comprises: refers to energy (electric power) output from a power supply circuit or a power supply device. Although this power supply is not strictly a circuit element, it is represented by a power supply symbol in a circuit diagram.
"auxiliary power supply circuit": an auxiliary power supply circuit provided in the circuit for operating the power supply circuit or the power supply device.
"auxiliary power supply": refers to energy (electric power) output from the auxiliary power supply circuit. Although the auxiliary power supply is not strictly a circuit element, it is represented by a power supply symbol or a capacitor symbol in a circuit diagram.
"rectifying element": an element through which current flows in only one direction. As an example of the rectifying element, a diode can be cited. As another example of the rectifying element, a transistor can be cited. Specifically, when the rectifier device is a transistor, the rectifier device turns on a current from the source to the drain when the gate is off, and cuts off the current from the drain to the source. Therefore, in this other example, it is considered that (i) the source is replaced by the node and (ii) the drain is replaced by the cathode, respectively.
"transistor element": when a gate of a MOSFET (Metal Oxide Semiconductor Field Effect Transistor) is turned on and off, whether or not a switching current flows from the drain to the source is determined. In the case where the element is a Bipolar Transistor, an IGBT (Insulated Gate Bipolar Transistor), or the like, (i) the drain may be replaced with a collector, and (ii) the source may be replaced with an emitter.
"switching element": and a component that can vary the voltage at any node (e.g., a switch node). The switching elements include a rectifying element, a transistor element, and a magnetic element (e.g., a winding and a coil of a transformer).
(outline of the configuration of the Power supply Circuit 10)
The power supply circuit 10 is a bidirectional DCDC converter capable of bidirectionally transferring power between a high-voltage power supply and a low-voltage power supply. The power supply circuit 10 is provided with (i) the auxiliary power supply circuit 1 and (ii) a load for test purposes of consuming power of the auxiliary power supply. The load is a circuit element for checking the operation of the auxiliary power supply, and is replaced with an arbitrary circuit when the power supply circuit 10 is actually used.
(constitution of high voltage part of Power supply Circuit 10)
The high-voltage unit is provided with a power source HV1 and a capacitor HC 1. The (+) side of the power source symbol indicates the positive side, and the (1) side indicates the negative side. The voltage of the negative electrode of HV1 is 0V, and the voltage of the positive electrode is 400V. The electrostatic capacitance of HC1 is lmF.
In the first embodiment, 0V is used as the reference potential. The node of 0V is referred to as a reference potential node. The potential higher than the reference potential is referred to as a high potential. Then, the node at the high potential is referred to as a high potential node. The high potential in this specification is, for example, a voltage of 10V to 1200V. The node of 400V is an example of a high potential node.
(configuration of Low Voltage part of Power supply Circuit 10)
The low-voltage part is provided with a power source LV1, a capacitor LC1, and a coil CO 1. The voltage of LV1 is 200V. The electrostatic capacitance of LC1 is lmF. The inductance of CO1 was lmH and the average current of CO1 was 12A. The voltage of LV1 is designed to be 1/2 of the voltage of HV 1.
(construction of switch part of Power supply Circuit 10)
The switch unit has a half-bridge configuration of switching element HS1 and switching element LS 1. One end of CO1 is connected to a switching node which is a connection point between HS1 and LS 1. The voltage at the switching node is alternately switched to a first voltage and a second voltage at a frequency of 100kHz by switching of HS1 or LS 1.
The first voltage is substantially the same voltage as the voltage (400V) of the high potential node. The second voltage is a voltage lower than the first voltage. In an example of the first embodiment, the second voltage is about 0V.
The first voltage in this specification means a voltage within ± 5V with respect to the voltage of the high potential node. In an example of the first embodiment, the first voltage is a voltage in a range of 395V or more and 405V or less. The range of the first voltage depends on the amount of voltage drop of HS 1.
HS1 and LS1 are both cascade GaN HEMTs having a drain withstand voltage of 650V and an on-resistance of 50m Ω. In the example of fig. 1, the cascode GaN-HEMT is represented using the circuit symbol of the MOSFET.
(constitution of auxiliary Power supply Circuit 1 of Power supply Circuit 10 1)
The auxiliary power supply circuit 1 includes HS1, an auxiliary power supply AV1, an auxiliary power supply AV2 (also referred to as a capacitor in the first embodiment), and a diode SD 1.
The auxiliary power supply circuit 1 is configured to receive power (receive power) from AV1 having a negative electrode connected to a switch node. The auxiliary power supply circuit 1 is configured to supply electric power (power transmission) to the AV2 having a negative electrode connected to the high potential node. In the example of fig. 1, the upper terminal of AV2 is the positive terminal of AV 2. Thus, the auxiliary power supply circuit 1 supplies the auxiliary power supply from the switch node to the high potential node.
HS1 is connected between the high potential node and the switch node. The anode of SD1 was connected to the anode of AV 1. In addition, the cathode of SD1 was connected to the anode of AV 2.
AV1 is an auxiliary power supply output from a flyback circuit (not shown) using an isolation transformer. AV1 is a 15V auxiliary power supply referenced to the switch node. AV2 is a 15V auxiliary power supply based on the high potential node. The electrostatic capacitance of AV2 was 100. mu.F. The forward Voltage (VF) at the on start time of SD1 was 0.7V. The resistance of SD1 in the on state was 0.1 Ω.
(constitution 2 of auxiliary Power supply Circuit 1 of Power supply Circuit 10)
The auxiliary power supply circuit 1 includes an auxiliary power supply AV3 (also referred to as a capacitor in the first embodiment) and a diode SD2 in addition to AV2 and SD 1.
The auxiliary power supply circuit 1 is configured to supply power to AV3 in addition to AV 2.
AV3 is a 15V auxiliary power supply based on the high potential node. In the example of fig. 1, the upper terminal of AV3 is the positive terminal of AV 3. The electrostatic capacitance of AV3 was 1 μ F. SD2 is the same specification as SD 1.
A coil PL1 (inductor 1 μ H) is provided in a charging path (described later) of the AV 3. PL1 is a circuit element connected for circuit stability evaluation. PL1 is not a circuit element necessary for the operation of the auxiliary power supply circuit 1.
In the first embodiment, the load resistors AL1 to AL3 are connected for the purpose of verifying the operation of the auxiliary power supply circuit 1. AL1 is connected in parallel with AV 1. AL2 is connected in parallel with AV 2. The resistance values of AL1 and AL2 were 7.5 Ω, respectively. AL3 is connected in parallel with AV 3. The resistance value of AL3 was 750 Ω.
(explanation of operation of the Power supply Circuit 10)
The power supply circuit 10 operates in the same manner as a normal bidirectional DCDC converter. The boosting operation of the power supply circuit 10 is as follows. In the following description, it is assumed that HS1 is cut off in advance.
(1) First, by turning on LS1, a current flows from the positive electrode of LV1 to the negative electrode of LV1 via CO1 and LS 1. At this time, the voltage of the switching node is reduced to about 0V (second voltage).
(2) First, by turning on LS1, current flows from the positive electrode of LV1 to the negative electrode of LV1 via CO1 and HS1 and HV 1. At this time, the voltage of the switch node rises to the voltage of the high potential node (first voltage).
In the boosting operation, the above (1) and (2) are repeated in order.
On the other hand, during the step-down operation of the power supply circuit 10, the HS1 is switched between on and off, and a current flows from the HV1 to the LV1 side. In the step-down operation, as in the case of the step-up operation described above, the voltage at the switching node is alternately switched between the first voltage and the second voltage.
(explanation of figure showing operation of auxiliary power supply circuit 1)
The operation of the auxiliary power supply circuit 1 will be described with reference to fig. 2 and 3. Fig. 2 is a graph showing waveforms of respective parts in the auxiliary power supply circuit 1. These waveforms are shown based on a common time axis (horizontal axis). The waveforms show respectively:
SWNV (switch node voltage): the voltage of the switching node relative to a reference potential;
HS1I (current of HS 1): a current flowing from the switching node toward the high potential node;
SD1I (current of SD 1): a current flowing from the anode toward the cathode;
SD2I (current of SD 2): a current flowing from the anode toward the cathode;
AV2V (voltage of AV 2): a voltage of the positive electrode with the negative electrode as a reference;
AV3V (voltage of AV 3): the voltage of the positive electrode with the negative electrode as a reference.
In fig. 3, the same circuit diagram as fig. 1 is shown, but the reference numerals of fig. 1 are omitted as appropriate. In fig. 3, current paths when AV2 and AV3 are charged are indicated by arrows.
(Driving method of auxiliary Power supply Circuit 1)
In the driving method of the auxiliary power supply circuit 1, the following three steps are performed in this order.
The first step: raising the SWNV to a first voltage;
a second step: a step of charging the AV2 with the SD 1I;
the third step: and a step of lowering the SWNV to a second voltage.
(first step: increasing SWNV)
Before the first engineering, the source-drain voltage of HS1 became about 400V (SWNV about 0V) due to the turning off of HS 1. In this state, the rectified current flows through HS1, and HS1 is turned on. Namely, HS1 is turned on. Thereby, SWNV rises to 400V, and becomes the first voltage. Time "about 1.00E-5 sec" in FIG. 2 is the time that the SWNV transitions to the first voltage. From this point in time, the voltages of the negative electrodes of AV1 and AV2 both become about 400V.
(second step: AV2 is charged by SD1I flowing through)
As SWNV rises, SD1I flows, charging AV 2. This is made up for the following reasons.
AV2 is a capacitor. Thus, as the energy of AL2 is consumed, the voltage of AV2 decreases. On the other hand, AV1 is the output power of the auxiliary power supply circuit using an insulation transformer. Therefore, the voltage of AV1 is not lowered. As a result, the voltage of AV2 becomes smaller than the voltage of AV 1.
Therefore, when the voltages of the cathodes of AV1 and AV2 become the same potential, a current flows from AV1 to AV2, which has a smaller voltage. The solid arrow AR1 in fig. 3 corresponds to this current path. Since this current flows through SD1, the charge of AV2 can be determined by measuring SD 1I.
In the period "about 1.00E-5 to 1.50E-5 sec" in FIG. 2, it can be confirmed whether SD1I flows or not. In this period, it was confirmed that AV2V was charged from 15.05V to 15.15V.
(third step: reducing SWNV to a predetermined voltage)
After charging of AV2, SWNV is set to about 0V. In the first embodiment, the parasitic capacitance of HS1 is charged, and SWNV is set to the second voltage. Therefore, the potential difference of the negative poles of AV1 and AV2 is about 400V. Therefore, SD1I does not flow from the positive electrode of AV1 (about 15V) to the positive electrode of AV2 (415V). That is, the charging of AV2 is temporarily stopped.
(charging of AV 3)
On the basis of AV2, the auxiliary power supply circuit 1 further includes AV 3. To charge AV3, SD2 was used. By measuring SD2I, the charging of AV3 can be confirmed. The charging path of AV3 is the double arrow AR2 of fig. 3.
In the auxiliary power supply circuit 1, a plurality of auxiliary power supplies can be manufactured by merely adding a diode and a capacitor. In addition, there is no particular problem even if parasitic inductance corresponding to PL1 exists in the auxiliary power supply circuit 1.
(points of improvement 1 to 3 for operating auxiliary power supply circuit 1)
A number of preferred improvements apply to the first embodiment. These preferred improvements will be described below.
(improvement point 1: the voltage of AV1 is less than the first voltage)
In the first embodiment, the first voltage is about 400V. On the other hand, the voltage of AV1 is 15V, less than 400V.
It is assumed that in the case where the voltage of AV1 is greater than the first voltage (for example, in the case where the voltage of AV1 is 450V), it is possible to apply a high voltage to HS 1. Specifically, when AV1 is activated in a state where the power supply circuit 10 is stopped, the parasitic capacitance of HS1 is charged via SD1, and a voltage of 450V is applied to HS 1. The charging path for the parasitic capacitance is AR1 of fig. 3.
Originally, the voltage applied to HS1 was assumed to be 400V. Therefore, there is a possibility that HS1 is damaged by overvoltage. Therefore, the voltage of AV1 is preferably less than the first voltage.
(improvement point 2: parasitic capacitance of SD1 is 1/20 or less of electrostatic capacitance of AV2)
In the example of the first embodiment, the parasitic capacitance of SD1 is 30 pF. When the switch node voltage rises, a reverse voltage is applied to SD 1. At this time, the current for charging the parasitic capacitance of 30pF flows from the positive electrode of AV2 to the positive electrode of AV 1. Since the voltage of AV2 is reduced, the parasitic capacitance of SD1 is preferably set to be small.
In the first embodiment, the parasitic capacitance of SD1 is set to 5% (1/20) or less of the electrostatic capacitance of AV 2. By setting the parasitic capacitance of SD1 in this way, the voltage drop rate of AV2 due to the discharge can be reduced to within about 5% (within a range that can be regarded as an error).
(improvement point 3: when a current flows from the switch node to the high potential node via HS1, a current flows from the positive electrode of AV1 to the positive electrode of AV2 via SD 1.)
The HS1 causes conduction loss in HS1 by flowing the rectified current toward the high potential node. On the other hand, the direction of the charging current (SD1I) of AV2 is the direction opposite to the direction of the above-described rectified current at the position of HS 1. Therefore, the current flowing through HS1 is cancelled by SD 1I. As a result, the conduction loss of HS1 is reduced.
The HS1I after the cancellation can be confirmed within a period of "about 1.00E-5 to 1.50E-5 sec" in FIG. 2. It was confirmed that the current that should originally flow through 12A (the current of CO 1) was reduced by a value of about 4A (about 8A). That is, the charging current of AV2 (4A of SD1I) reduced HS1I by about 4A.
[ second embodiment ]
The auxiliary power supply circuit 1 according to one aspect of the present invention can be used for reducing the switching loss generated in HS1 or LS 1. Specifically, the switching loss is reduced by reducing the transient current generated at the time of switching. The transient current referred to herein is, for example, a recovery current or a charging current of a parasitic capacitance.
The power supply circuit 20 of fig. 4 is a bidirectional DCDC converter, similar to the power supply circuit 10. In the power supply circuit 20, AL1 and AL2 are replaced with a reduction circuit of the transient current generated in HS1 and LS1 with respect to the power supply circuit 10.
A circuit for reducing the transient current of HS1 will be described. The auxiliary switch AS2, the auxiliary coil AC2, and the auxiliary diode AD2, which are added around the AV2, can cut transient current generated in the HS 1. The reduction method is as follows. First, by turning on AS2 before the transient current flows, the energy of AV2 is converted into magnetic energy by flowing through AC 2. Then, by turning off AS2, the magnetic energy is converted into a current passing through AD2 and flows to HS 1. Therefore, the transient current of the current flowing through the AD2 can be cut.
LS1 also constitutes a transient current reduction circuit similar to the example of HS 1. The auxiliary switch AS1, the auxiliary winding AC1, and the auxiliary diode AD1, which are added around the AV1, are transient current reduction circuits with respect to the LS 1. The same applies to the transient current reduction method.
In the power supply circuit 20, AL3 of the power supply circuit 10 is replaced with a gate drive circuit GD 1. GD1 drives the gate of AS 2.
[ third embodiment ]
The Power supply circuit 10 according to an aspect of the present disclosure may be applied to an inverter circuit, a totem pole PFC (Power Factor Correction) circuit, and the like, in addition to the bidirectional DCDC converter.
Fig. 5 is a diagram showing a power supply device 100 provided with the power supply circuit 10. According to the auxiliary power supply circuit 1, an auxiliary power supply with reference to the high potential node can be supplied to the power supply circuit 10 and the power supply device 100. Further, the power supply circuit 10 includes a control circuit 9. The control circuit 9 controls on/off switching of each element provided in the power supply circuit 10. In particular, the control circuit 9 controls on/off switching of HS1 and LS 1.
[ conclusion ]
An auxiliary power supply circuit according to aspect 1 of the present disclosure receives power from an auxiliary power supply whose negative electrode is connected to a switch node, and supplies power to a capacitor whose negative electrode is connected to a high potential node, the auxiliary power supply circuit including: a switching element connected between the high potential node and the switching node; and a diode having an anode connected to a positive electrode of the auxiliary power supply and a cathode connected to a positive electrode of the capacitor, wherein a voltage of the switching node is alternately switched to (i) a first voltage substantially equal to a voltage of the high potential node and (ii) a second voltage lower than the first voltage.
According to the above configuration, the voltage of the switching node is switched to the first voltage (for example, high potential), and the auxiliary power supply charges the capacitor via the diode and the switching element. On the other hand, when the voltage of the switching node is switched to the second voltage, the diode can prevent the capacitor from discharging. Specifically, the diode cuts off the current flowing from the capacitor to the auxiliary power supply. Therefore, the capacitor functions as an auxiliary power supply.
In the auxiliary power supply circuit according to mode 2 of the present disclosure, a voltage of the auxiliary power supply is smaller than the first voltage.
According to the above configuration, the voltage of the auxiliary power supply does not cause damage to the switching element due to overvoltage applied thereto.
In the auxiliary power supply circuit according to mode 3 of the present disclosure, the parasitic capacitance of the diode is 1/20 or less of the electrostatic capacitance of the capacitor.
According to the above configuration, a voltage drop of the capacitor, which occurs when the voltage of the switching node becomes the second voltage, can be reduced to about 5% or less.
In the auxiliary power supply circuit according to aspect 4 of the present disclosure, when a current flows from the switch node to the high potential node via the switching element, the current flows from the positive electrode of the auxiliary power supply to the positive electrode of the capacitor via the diode.
According to the above configuration, since the current of the switching element is reduced, the conduction loss and heat generation of the switching element can be reduced.
The auxiliary power supply circuit according to aspect 5 of the present disclosure includes an auxiliary power supply circuit according to an aspect of the present disclosure.
With the above configuration, a power supply device including an auxiliary power supply at a high potential node can be realized.
[ Note attached ]
An embodiment of the present disclosure is not limited to the above embodiments, and various modifications can be made within the scope shown in the claims, and embodiments obtained by appropriately combining technical means disclosed in different embodiments are also included in the technical scope of the present invention. Further, new technical features can be formed by combining the technical methods disclosed in the respective embodiments.
Claims (5)
1. An auxiliary power supply circuit characterized in that,
the auxiliary power supply circuit receives power from an auxiliary power supply whose negative electrode is connected to the switch node and supplies power to a capacitor whose negative electrode is connected to the high potential node,
the auxiliary power supply circuit includes:
a switching element connected between the high potential node and the switching node; and
a diode having an anode connected to the positive electrode of the auxiliary power supply and a cathode connected to the positive electrode of the capacitor,
the voltage of the switching node is alternately switched to (i) a first voltage that is the same voltage as the voltage of the high potential node and (ii) a second voltage lower than the first voltage.
2. An auxiliary power supply circuit as claimed in claim 1,
the voltage of the auxiliary power supply is less than the first voltage.
3. An auxiliary power supply circuit as claimed in claim 1,
the parasitic capacitance of the diode is 1/20 or less of the electrostatic capacitance of the capacitor.
4. An auxiliary power supply circuit as claimed in claim 1,
when a current flows from the switch node to the high potential node via the switching element, a current flows from the anode of the auxiliary power supply to the anode of the capacitor via the diode.
5. A power supply device is characterized in that,
comprising the auxiliary power supply circuit of claim 1.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2020044289A JP2021145527A (en) | 2020-03-13 | 2020-03-13 | Auxiliary power supply circuit and power supply device |
| JP2020-044289 | 2020-03-13 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN113394976A true CN113394976A (en) | 2021-09-14 |
Family
ID=77617330
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110215043.1A Withdrawn CN113394976A (en) | 2020-03-13 | 2021-02-25 | Auxiliary power supply circuit and power supply device |
Country Status (3)
| Country | Link |
|---|---|
| US (1) | US20210288577A1 (en) |
| JP (1) | JP2021145527A (en) |
| CN (1) | CN113394976A (en) |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH05176541A (en) * | 1991-12-25 | 1993-07-13 | Nec Home Electron Ltd | Auxiliary power circuit |
| JP2005110397A (en) * | 2003-09-30 | 2005-04-21 | Tdk Corp | Switching power supply |
| CN102751881A (en) * | 2011-04-02 | 2012-10-24 | 英飞特电子（杭州）股份有限公司 | Auxiliary power circuit of two-line light modulator |
| JP2017046470A (en) * | 2015-08-27 | 2017-03-02 | 沖電気工業株式会社 | Drive power supply circuit |
| US20180145242A1 (en) * | 2015-07-28 | 2018-05-24 | Murata Manufacturing Co., Ltd. | Power supply circuit and ac adaptor |
| CN110661401A (en) * | 2018-06-29 | 2020-01-07 | 戴泺格半导体股份有限公司 | Bootstrap capacitor for charging switching power converter |
-
2020
- 2020-03-13 JP JP2020044289A patent/JP2021145527A/en active Pending
-
2021
- 2021-02-25 CN CN202110215043.1A patent/CN113394976A/en not_active Withdrawn
- 2021-03-04 US US17/192,721 patent/US20210288577A1/en not_active Abandoned
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH05176541A (en) * | 1991-12-25 | 1993-07-13 | Nec Home Electron Ltd | Auxiliary power circuit |
| JP2005110397A (en) * | 2003-09-30 | 2005-04-21 | Tdk Corp | Switching power supply |
| CN102751881A (en) * | 2011-04-02 | 2012-10-24 | 英飞特电子（杭州）股份有限公司 | Auxiliary power circuit of two-line light modulator |
| US20180145242A1 (en) * | 2015-07-28 | 2018-05-24 | Murata Manufacturing Co., Ltd. | Power supply circuit and ac adaptor |
| JP2017046470A (en) * | 2015-08-27 | 2017-03-02 | 沖電気工業株式会社 | Drive power supply circuit |
| CN110661401A (en) * | 2018-06-29 | 2020-01-07 | 戴泺格半导体股份有限公司 | Bootstrap capacitor for charging switching power converter |
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| 满海峰: "一种宽脉冲高重频浮动板调制器的设计", 雷达科学与技术, vol. 11, no. 1, pages 82 - 86 * |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2021145527A (en) | 2021-09-24 |
| US20210288577A1 (en) | 2021-09-16 |
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Application publication date: 20210914 |